Inertial electrostatic confinement. The concept was discovered over a century ago.
A fusion reaction in a bell jar. The trick is the energy conversion, and energy gain.
I did some experiments with this process about 20 years ago.
To be commercially viable, the energy gain would have to be at least 20 to 1.
The process would produce fast neutrons, a lot of x-rays, and a helium daughter product.
The key will be direct conversion of reaction to electric potential.
Think of a diode vacuum tube with a nuclear powered cathode, with a fusion powered supply of electrons.
Lord knows that old Ben is not a scientist of any sort, but wouldn’t fast neutrons and x-rays be dangerous?